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Title: Enhancing Cycling Stability and Capacity Retention of NMC811 Cathodes by Reengineering Interfaces via Electrochemical Fluorination

Journal Article · · Advanced Materials Interfaces

High-capacity cathodes (LiNi0.8Mn0.1Co0.1O2) that can boost the energy density of lithium-ion batteries are promising candidates for vehicle electrification. However, several factors specific to high energy density materials entailing electrode reactions inhibit their application. Fluorination has shown a promising ability to combat the detrimental electrochemical performances of cathode materials, however, it remains difficult to achieve the desired functionality. In this work, a novel electrochemical fluorination (ECF) that demonstrates a promising electrochemical performance enhancement via stabilization of the cathode–electrolyte-interphase (CEI) by forming conformal LiF is proposed. Besides LiF surface layer formation, ECF reduces the degree of fluorination-induced Ni/Li disordering and enhances the layered structural stability as probed by X-ray diffraction. Because of the robust CEI, ECF-NMC811 cathodes deliver 203.0 mAh g-1 first discharge capacity at the current rate of C/10, with ≈98% capacity retention up to 100 cycles. Similarly, it delivers ≈180 mAh g-1 capacity at a 1 C rate with 86.4% capacity retention up to 200 cycles with average coulombic efficiency of > 99.5%. Comprehensive characterization with a multitude of probes reveals that ECF enhances the cycling stability of the electrode without altering bulk structure and morphology.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division
Grant/Contract Number:
AC05-00OR22725; SC0012704
OSTI ID:
1873831
Journal Information:
Advanced Materials Interfaces, Journal Name: Advanced Materials Interfaces Journal Issue: 18 Vol. 9; ISSN 2196-7350
Publisher:
Wiley-VCHCopyright Statement
Country of Publication:
United States
Language:
English

References (46)

Insight into the Solid Electrolyte Interphase Formation in Bis(fluorosulfonyl)Imide Based Ionic Liquid Electrolytes journal February 2021
High-Voltage Lithium-Metal Batteries Enabled by Localized High-Concentration Electrolytes journal March 2018
A Novel Electrolyte Salt Additive for Lithium-Ion Batteries with Voltages Greater than 4.7 V journal November 2016
From Surface ZrO 2 Coating to Bulk Zr Doping by High Temperature Annealing of Nickel-Rich Lithiated Oxides and Their Enhanced Electrochemical Performance in Lithium Ion Batteries journal September 2017
Prospect and Reality of Ni-Rich Cathode for Commercialization journal November 2017
Nickel-Rich Layered Lithium Transition-Metal Oxide for High-Energy Lithium-Ion Batteries journal March 2015
Simultaneously Boosting the Ionic Conductivity and Mechanical Strength of Polymer Gel Electrolyte Membranes by Confining Ionic Liquids into Hollow Silica Nanocavities journal September 2019
Fluorination of Li‐Rich Lithium‐Ion‐Battery Cathode Materials by Fluorine Gas: Chemistry, Characterization, and Electrochemical Performance in Half Cells journal July 2019
Fluorination of MXene by Elemental F 2 as Electrode Material for Lithium‐Ion Batteries journal March 2019
Synthesizing High‐Capacity Oxyfluoride Conversion Anodes by Direct Fluorination of Molybdenum Dioxide (MoO 2 ) journal July 2020
An Electron Diffraction and Crystal Chemical Investigation of Oxygen/Fluorine Ordering in Rutile-Type Iron Oxyfluoride, FeOF journal December 2000
Degradation Mechanisms and Mitigation Strategies of Nickel-Rich NMC-Based Lithium-Ion Batteries journal October 2019
Effects of heteroatoms on electrochemical performance of electrode materials for lithium ion batteries journal August 2002
Highly Fluorinated Interphases Enable High-Voltage Li-Metal Batteries journal January 2018
Improving the cycling performance of LiNi0.8Co0.1Mn0.1O2 by surface coating with Li2TiO3 journal September 2016
A perspective on nickel-rich layered oxide cathodes for lithium-ion batteries journal January 2017
Chemical stability and long-term cell performance of low-cobalt, Ni-Rich cathodes prepared by aqueous processing for high-energy Li-Ion batteries journal January 2020
Significantly improving cycling performance of cathodes in lithium ion batteries: The effect of Al2O3 and LiAlO2 coatings on LiNi0.6Co0.2Mn0.2O2 journal February 2018
Ni/Li Disordering in Layered Transition Metal Oxide: Electrochemical Impact, Origin, and Control journal June 2019
Capacity Fading of Ni-Rich Li[Ni x Co y Mn 1– xy ]O 2 (0.6 ≤ x ≤ 0.95) Cathodes for High-Energy-Density Lithium-Ion Batteries: Bulk or Surface Degradation? journal January 2018
Evolution of Structure and Lithium Dynamics in LiNi 0.8 Mn 0.1 Co 0.1 O 2 (NMC811) Cathodes during Electrochemical Cycling journal March 2019
Improving Performance of LiNi 0.8 Co 0.1 Mn 0.1 O 2 Cathode Materials for Lithium-Ion Batteries by Doping with Molybdenum-Ions: Theoretical and Experimental Studies journal May 2019
Long-Life Nickel-Rich Layered Oxide Cathodes with a Uniform Li 2 ZrO 3 Surface Coating for Lithium-Ion Batteries journal March 2017
Enhanced Cycling Performance of Ni-Rich Positive Electrodes (NMC) in Li-Ion Batteries by Reducing Electrolyte Free-Solvent Activity journal June 2019
Structural and Electrochemical Aspects of LiNi 0.8 Co 0.1 Mn 0.1 O 2 Cathode Materials Doped by Various Cations journal January 2019
Controlled Formation of Mixed Nanoscale Domains of High Capacity Fe 2 O 3 –FeF 3 Conversion Compounds by Direct Fluorination journal February 2015
Low-Temperature Fluorination of Soft-Templated Mesoporous Carbons for a High-Power Lithium/Carbon Fluoride Battery journal October 2011
Lithium Batteries and Cathode Materials journal October 2004
Formation of Iron Oxyfluoride Phase on the Surface of Nano-Fe 3 O 4 Conversion Compound for Electrochemical Energy Storage journal October 2013
Issues and challenges facing rechargeable lithium batteries journal November 2001
Building better batteries journal February 2008
High-energy cathode material for long-life and safe lithium batteries journal March 2009
Reviving the lithium metal anode for high-energy batteries journal March 2017
High energy-density and reversibility of iron fluoride cathode enabled via an intercalation-extrusion reaction journal June 2018
All-temperature batteries enabled by fluorinated electrolytes with non-polar solvents journal October 2019
Ultra-high-voltage Ni-rich layered cathodes in practical Li metal batteries enabled by a sulfonamide-based electrolyte journal March 2021
Non-flammable electrolyte enables Li-metal batteries with aggressive cathode chemistries journal July 2018
Self-smoothing anode for achieving high-energy lithium metal batteries under realistic conditions journal April 2019
Role of precursor chemistry in the direct fluorination to form titanium based conversion anodes for lithium ion batteries journal January 2015
Lithium manganese oxyfluoride as a new cathode material exhibiting oxygen redox journal January 2018
Probing microstructure and electrolyte concentration dependent cell chemistry via operando small angle neutron scattering journal January 2019
Selective electrochemical fluorination of organic molecules and macromolecules in ionic liquids journal January 2011
Towards the selective modification of soft-templated mesoporous carbon materials by elemental fluorine for energy storage devices journal January 2013
Factors that affect Li mobility in layered lithium transition metal oxides journal September 2006
Iron Oxyfluorides as High Capacity Cathode Materials for Lithium Batteries journal January 2009
Effect of Ambient Storage on the Degradation of Ni-Rich Positive Electrode Materials (NMC811) for Li-Ion Batteries journal January 2018